Shunt coil for electric meters



Jan. 1 1924 J. CHOPPINET snuu'r COIL FOR ELECTRIC METERS Filed July 15 1921 Fig.4

Im/ehfor Jchoppinef 3 M film z Patented Jan. 1, 1924.

UNITED STATES JOSEPH CHOPPINET. OF BRUSSELS, BELGIUM.

SHUNT COIL FOE ELECTRIC METERS.

Application filed July 15,

To all whom it may concern:

Be it known that I, JOSEPH CrroPPiNE'r, a subject of the King of Belgium, and resident of Brussels, Belgium, have invented certain new and useful Improvements in and Relating to Shunt Coil for Electric Meters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. reference being had to the accompanying drawings, and to letters or figures of reference marked therein, which form a part of this specification.

This invention relates to an arrangement of a voltage coil and magnetic core in such a manner that the parts may be readily disassembled.

This arrangement is intended for electric meters or induction wattmeters, and generally for apparatus working on the type of an induction electric motor according to Ferraris principle.

In known apparatus of this kind, such as measuring apparatus of the wattmeter type for alternating single or polyphase current, the voltage coil and current coils are mounted on a common core having three arms generally consisting of laminated sheets of soft iron and cut in one piece, an armature rotating in front of them.

The current coils are mounted on the side arms, the voltage coil on the central arm, the latter is moreover provided at its lower part with members for adjusting the phase displacement.

When, owing to an accident, (which in fact happens quite frequently) such as an excess of voltage, lightning, dampness. shock, etc., a few turns of the voltage coil are burnt or damaged, the replacement of this coil requires a new adjustment, generally a complete one of the meter.

It is indeed impossible to take to pieces and to mount again a new voltage coil with out taking to pieces at least those parts of the apparatus which are utilized for starting purposes and for adjusting the phase displacement through which in fact involves a new general adjustment which is long and delicate, of all the members.

According to the present invention, the voltage coil and in some cases its core. may be immediately replaced without any of the members serving for any of the adjustments of the measuring apparatus being dis- 1921. Serial No. 485,137.

mounted or put out of adjustment. To this end, the central core is made removable and the mounting of the voltage coil is such that it may he slid off, in case of damage thereto, and replaced by one which is cali' brated and standardized according to each type of the apparatus.

The invention relates also to the means for the fixation of the core with its coil.

The accompanying drawings illustrate by way of example, the application of the invention to a single phase meter.

Fig. 1 is a view of a single phase meter taken on the side of the field magnet.

Fig. 2 is a section along the line X X of Fig. 1.

Fi s. 3 and 4 illustrate by way of example two orms of construction of the core with the voltage coil.

Referring to the drawings, the meter comprises a frame 1 against which a horse shoe shaped core 8 provided at its ends 8 and 8" with current coils 9 and 10 is fixed by means of screws 45 and of a transverse member 4 also screwed on to the said frame at 6 and 7.

The voltage coil 11 slides with slight friction upon its core 12 (see Fig. 3) and is held thereon at a suitable height owing to the fact that its height corresponds to the inside upper opening of the core 8. The core 12 is provided at its lower part with a ring 14 called a short circuit ring serving to adjust the phase displacement. At the upper part of the core, one of the sheet iron laminations having a suitable thickness and which constitutes the said core, has an extension shown at 16. A hole is provided in the said extension for receiving a screw 17 by means of which the core is fixed to the horse-shoe armature 8.

If the voltage coil 11 is damaged or rendered useless, the meter mechanism is removed from its casing (not shown) without interfering with any of the adjusting parts, and the screws 17 and 44 are removed and the whole of the core 12 and its coil 11 are withdrawn as a unit. After having subsequently withdrawn the coil from the core, a new coil exactly calibrated and standardized is slid thereon and said core 12 is replaced in the openin provided at the upper part of the core 8. he core 12 is screwed again and the meter is replaced in position without it being necessary to interfere with the adjusting ring 14 or with the adjusting platekaflsthesmatiga couple, lfimonmwith ,the aetfi-n described e maguetizalxle em'e, arms adjustment I9 of the braking magnet cfarijied' said (jore, ene'jol se The extension 16 may be made of a 12mg; remgyable, current netlc or non-magnet ig n1et;3 l

iil arms being windings tjilllletl by othegs oj sa d gug s, a rotatable armature Other devices for fixing: the remo able associated with said imignvtizuhle rore, eore in operative positionrmaybel-used io u mennsto lemonahly serure the removalile instance, :1 right-angled fixation mexnherl or arm to said magnetizing wore, :1 short eira screw such as shown-in-Figu4.--

As shown in Fig. 4 the core 12 is secured and a voltage coil remombly mounted on in place by means of wsoren iZO which said removable arm adapted to be're'ploeeal passes through an aperture provided in'the subsequent EDfllGiZOD'lOVtLl' of mltl'ixl'lil witheore 8 and isth-readed in the ewe-'12. The out 'interferenee'ofthe lll lllStll tell' flfif' the said screw which maybe inatle of a meginBtruInent' noble metal passes through the core 8 and presses the core- ],2 -=-a;g ain'st wit.

In the case Where rites-desired magnet cair ried bfy said-oormonool' mid airms'loeitig ieally to insulate tho-core 12 i'romtheeffinummovable, *ou-nre'ntw windings carried -by rule 8. tlie'screw maybe made'of per otherof said Firms, a rotatable armature '01" eny other non-magnetic"metslw li' om societal-with said'magnetimhle core,'-me'o,i1s 7 20 over, if it is-desi recl toeillowa-g-asp between torem'oVably-seeure the removable eem-to the removable core-mendthe armature 8m. said-magnetizing "core, :1slmrtwoimuitring plate or out QL-made of-en insulating'inm carried by' said removable ttP-inpi voltage terial or non-magnetic 'srte'd therein.

According to this invention, the I flelay cuitring earriedp by said removable arm,

341-11 an electric instrument ot' theeh'ameeter'fdeserlbedfa magnetiznhle (sore; firms coil remov aibly mounted on sent removable arm'edztptedtowbe replaoell" subsequent to the removal of said- :mn without interfera'ndineonveniendewformerly *er aused when e'libe ef'theadjustment-ol the instrument. replacing a defective-voltage Cfillyflwlng to and means to maintain said voltage coil In the necessity of readjusting thoshort ei'rpredeterniined positiom wtthmespeet to'the cuit ring anclother pants;areeliminated' as, magnetmable-eore. when such replacement is-req1flived;rtheeose 43111 an instrument dthe -oherzteterrde- 12 is dismountedand'ai newvoltage-eoil slid Beribed armagne tizalo-lecore inolu ding'theee 'upo'nit for replati'L-ng the=defeetive voltage arms, a rotatable armature -a'rmnged etlcoil. 'This operation does-mot" require the "jilQBIlt" saidmnms; magnetizebledteeper, removal of the horsesheeermature;northe eul reithwindingson eertaiin'et sail-(harms, displacement of the short circuit ring,-either ai x'woltageeoilv on another 4 0t said afmsfin of 'which acts would ob'tious-lyinvoltce u shorbei rcwi tmrmg Onthe -last-mtantioad newcomplete 'a Claims: i i i 1. In 'an instrument oill the arm, windiest-mentioned arm being-memos aJbLQ"t/Qg6ther With-said voltege eoil: to: perj m i i awm tjjabl' k i magnetizeblecore;and mei'mssecuning said current windings on certain said arms. e t Q- a voltage coil on another ofseid" '2tIIl1'S,'"H-I1'Cl y' l'effixmyrslisnamre a"short' ciruit on 'the'lalst'mentionea pm of WitnBSSeS- :n'mg'said 'last mntionefl armherrr remov able; together With said-voltage-"em lnit'replaeement" ofthe'latterr 211i; an electric m stmmm of JosEmi-oHoePm-ET.

bhfijragtr doimitrep-laeement ofthe: latter insulating F" scribed, w'maignetiiablwcore including-three d emm g (element e p s o arms, a rotatable"armetinte 'airrangiede'a We 'f B a t--menti0ndamn antlfisiiid 

